v.21.7Improvement

Improve Startup Time of Distributed Engine

Improve startup time of Distributed engine. #25663 (Azat Khuzhin).
Improved the startup time of the Distributed engine in ClickHouse.

Why it matters

This feature reduces the initialization latency of the Distributed engine, allowing queries involving distributed tables to start faster. It enhances overall system responsiveness and efficiency when working with distributed queries.

How to use it

The improvement is applied internally and requires no user configuration. Users benefit automatically from faster Distributed engine startup after upgrading to the new version.